Sheet processing apparatus having punching unit
a technology of punching unit and sheet processing apparatus, which is applied in the direction of electrographic process, manufacturing tools, instruments, etc., can solve the problems of insufficient width direction of sheet ejection offset movement by the shift roller pair b>3/b> and b>4/b>, so as to accelerate the sheet conveying speed and shorten the punching process time
Inactive Publication Date: 2012-05-22
CANON KK
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Benefits of technology
[0019]According to the present invention, since the sheet ejection offset is executed during the punching operation to the sheet, the sheet ejection offset can be started before conveying the sheet after punching. This enables to accelerate the sheet conveying speed. And therefore, even when there is only one shift roller pair, the sheet ejection offset can be completed before the rear edge of the sheet passes the shift roller pair. As a result, the shift roller pair can be quickly returned to a standby position, and the punching process time can be shortened.
[0020]Since the punching unit returns to the standby position at the time when the punching operation finishes, a moving range of the punching unit can be narrowed and the moving mechanism of the punching unit can be miniaturized.
Problems solved by technology
This causes a problem that the movement of the sheet by the shift roller pairs 3 and 4 in the width direction for the sheet ejection offset becomes insufficient.
Method used
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[0034]Hereafter, embodiments according to the present invention will be described in detail with reference to the drawings.
[0035]FIG. 1 is a sectional view showing an image forming system 1000 including a sheet processing apparatus 500 according to an embodiment of the present invention.
[0036]As shown in FIG. 1, the image forming system 1000 consists of an image forming apparatus 10 and the sheet processing apparatus 500, which is connected to a sheet ejection side the image forming apparatus 10.
[0037]FIG. 2 is a sectional view of the sheet processing apparatus 500. As shown in FIG. 2, the sheet processing apparatus 500 executes various processes including: a process of taking in sheets conveyed from the image forming apparatus 10, a process of adjusting and bundling a plurality of taken-in sheets, a sorting process, a non-sorting process, a staple process (a stitch process) of stapling a rear end of a sheet bundle, a punching process of punching a punch hole in the rear end of a sh...
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Abstract
A sheet processing apparatus that allows to accelerate a punching process while executing a sheet ejection offset certainly. A conveying unit conveys a sheet. A first moving unit moves the sheet conveyed by the conveying unit in a width direction that crosses a conveying direction of the sheet. A punching unit punches a hole in the sheet. A second moving unit moves the punching unit in the width direction. A control unit controls the first moving unit so as to change positions of sheets ejected to a sheet stack unit in the width direction by turns for every sheet bundle sorted. The control unit controls the second moving unit and the punching unit so as to execute a punching operation by the punching unit while moving the punching unit in synchronization with the movement of the sheet by the first moving unit.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a sheet processing apparatus having a punching unit that punches a hole in a sheet outputted from an image forming apparatus such as a copier or a laser beam printer.[0003]2. Description of the Related Art[0004]A conventional sheet processing apparatus punches a hole in a recording sheet, on which an image is formed, one by one during conveyance (for example, see Japanese Laid-Open Patent Publication (Kokai) No. 2007-76775 (JP 2007-76775A)).[0005]FIG. 10 is a sectional view of the above-mentioned conventional sheet processing apparatus. As shown in FIG. 10, the conventional sheet processing apparatus 1a is connected to a sheet ejection side of an image forming apparatus 300 that forms an image on a sheet. The sheet processing apparatus 1a is provided with a punching device 50 that punches a hole in a sheet on which an image is formed by the image forming apparatus 300 and that is conveye...
Claims
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IPC IPC(8): B26D5/00
CPCB65H33/08B65H35/02G03G15/6582B65H2301/4213B65H2301/4219G03G2215/00818B65H2801/27G03G2215/00426B65H2301/5152Y10T83/6539Y10T83/8748
Inventor KATO, HITOSHIISHIKAWA, NAOKIFUKATSU, YASUO
Owner CANON KK